National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

3 Miles NNW Ontario WI

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 48. East wind around 8 mph.

    Low: 48 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 67. Breezy, with an east wind 9 to 16 mph, with gusts as high as 24 mph.

    High: 67 °F

    Mostly Sunny
    then Partly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 50. East wind 6 to 14 mph, with gusts as high as 24 mph.

    Low: 50 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers after 1pm. Partly sunny, with a high near 73. Southeast wind around 6 mph becoming calm in the afternoon.

    High: 73 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 50. Calm wind.

    Low: 50 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 52. Calm wind.

    Low: 52 °F

    Mostly Clear

  • Memorial Day

    Memorial Day: Sunny, with a high near 86. Calm wind becoming south 5 to 8 mph in the morning.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. Calm wind.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 48. East wind around 8 mph.
Friday
Partly sunny, with a high near 67. Breezy, with an east wind 9 to 16 mph, with gusts as high as 24 mph.
Friday Night
Mostly cloudy, with a low around 50. East wind 6 to 14 mph, with gusts as high as 24 mph.
Saturday
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 73. Southeast wind around 6 mph becoming calm in the afternoon.
Saturday Night
Mostly cloudy, with a low around 50. Calm wind.
Sunday
Mostly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 52. Calm wind.
Memorial Day
Sunny, with a high near 86. Calm wind becoming south 5 to 8 mph in the morning.
Monday Night
Mostly clear, with a low around 58. Calm wind.
Tuesday
Mostly sunny, with a high near 87. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
A 20 percent chance of showers. Mostly clear, with a low around 59. Calm wind.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87. Calm wind becoming southeast 5 to 8 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 59. East wind around 6 mph.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83. East wind 5 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Ontario WI
 43.75°N 90.61°W
Last Update:
2:21 am CDT May 22, 2026
Forecast Valid:
3am CDT May 22, 2026-6pm CDT May 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation